JP2001015127A - Electrolytic film/electrode bonded body and solid polyelectrolyte type fuel cell - Google Patents

Electrolytic film/electrode bonded body and solid polyelectrolyte type fuel cell

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Publication number
JP2001015127A
JP2001015127A JP18184599A JP18184599A JP2001015127A JP 2001015127 A JP2001015127 A JP 2001015127A JP 18184599 A JP18184599 A JP 18184599A JP 18184599 A JP18184599 A JP 18184599A JP 2001015127 A JP2001015127 A JP 2001015127A
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solid polymer
polymer electrolyte
electrode
electrolyte membrane
sheet
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Kyoichi Urabe
恭一 卜部
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Fuji Electric Co Ltd
富士電機株式会社
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/02Details
    • H01M8/0271Sealing or supporting means around electrodes, matrices or membranes
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/10Fuel cells with solid electrolytes
    • H01M8/1007Fuel cells with solid electrolytes with both reactants being gaseous or vaporised
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/56Manufacturing of fuel cells

Abstract

PROBLEM TO BE SOLVED: To manufacture a fuel cell at low cost by forming a solid polymer electrolytic film region in a central part and an anode electrode and a cathode electrode in both principal faces of an electrolytic film/insulating film bonded sheet having insulating film regions in its circumference. SOLUTION: The edge part of an electrolytic film 1 is sandwiched between two insulating films 10A formed into a frame shape by hollowing out the central parts of the insulating films, whose one sides are longer than that of the solid polymer electrolytic film 1, bonded together with adhesive so as to be formed into a solid polymer electrolytic film/insulating film bonded sheet 13. Then, an electrode catalyst layer 2 is bonded and formed in the solid polyelectrolyte regions on the both major faces of the bond sheet 13 by thermocompression bonding. After adhesive is applied to the insulating film regions on the both major faces of the bonded sheet 13, electrode substrates 3 are laminated and bonded so that an electrolytic film/electrode bonded body 6 is provided. A plastic sheet composed of polyethylene terephthalate, polyethylene, etc., and a rubber sheet are used for the insulating film 10A.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、固体高分子電解質型燃料電池のセル構造、特に高分子電解質膜と電極との接合体の構造に関する。 The present invention relates to a solid polymer electrolyte fuel cell structure of the battery, particularly to a structure of a joined body of the polymer electrolyte membrane and the electrode.

【0002】 [0002]

【従来の技術】固体高分子電解質型燃料電池は、公知のように、固体高分子電解質膜の両主面にアノード電極とカソード電極とが形成され、前記各電極に燃料ガスと酸化剤ガスをそれぞれ供給することにより発電を行う発電装置の一種である。 BACKGROUND ART Solid polymer electrolyte fuel cells, as is known, on both principal surfaces of the solid polymer electrolyte membrane and the anode and cathode electrodes are formed, a fuel gas and an oxidant gas to the respective electrodes it is a kind of power generator that generates power by supplying respectively.

【0003】固体高分子電解質膜には、スルホン酸基を持つポリスチレン系の陽イオン交換膜をカチオン導電性膜として使用したもの、フロロカーボンスルホン酸とポリビニリデンフロライドの混合膜、フロロカーボンマトリックスにトリフロロエチレンをグラフト化したもの、 [0003] Solid polymer electrolyte membrane obtained by using a cation exchange membrane of polystyrene having a sulfonic acid group as a cation conductive film, fluorocarbon sulfonic acid and a polyvinylidene fluoride mixed film of trifluoroacetic the fluorocarbon matrix that of ethylene was grafted,
あるいはパーフルオロスルホン酸樹脂膜等が用いられる。 Alternatively perfluorosulfonic acid resin film or the like is used.

【0004】固体高分子電解質膜は、分子中にプロトン(水素イオン)交換基を有し、飽和に含水させることにより常温で20Ω・cm以下の比抵抗を示し、プロトン導電性電解質として機能する。 [0004] Solid polymer electrolyte membrane has a proton (hydrogen ion) exchange group in the molecule, shows a 20 [Omega · cm or less in specific resistance at room temperature by water saturation, and functions as a proton conductive electrolyte. 電極基材は多孔質体で燃料電池の反応ガス(燃料ガスと酸化剤ガス)の供給、排出手段及び集電体として機能する。 Electrode substrate supply of the reaction gas in the fuel cell with a porous material (fuel gas and oxidant gas), which functions as an exhaust means and a current collector. アノード電極またはカソード電極においては、気相、液相及び固相の三相界面が形成され、電極触媒の触媒作用により次のような電気化学反応が起きる。 In the anode electrode or cathode electrode, gas phase, is formed three-phase interface of the liquid and solid phases, the electrochemical reactions as follows occurs by the catalytic action of the electrode catalyst.

【0005】 アノード : H 2 →2H + +2e -カソード : 1/2O 2 +2H + +2e - →H 2 O すなわち、アノードにおいては燃料電池の外部より供給された水素ガスからプロトンと電子が生成し、このプロトンは固体高分子電解質膜内をカソードに向かって移動する。 [0005] The anode: H 2 → 2H + + 2e - cathode: 1 / 2O 2 + 2H + + 2e - → H 2 O In other words, protons and electrons are generated from the hydrogen gas supplied from the outside of the fuel cell at the anode, this protons migrate toward the cathode through the solid polymer electrolyte membrane. 一方、カソードにおいては、燃料電池の外部より供給された酸化剤ガス中の酸素と固体高分子電解質膜中をアノードより移動してきたプロトンと外部回路を経由してきた電子とが反応し、水を生成する。 On the other hand, in the cathode, the electrons having passed through the proton and an external circuit that the oxygen and the solid polymer electrolyte membrane have moved from the anode in the oxidizing gas supplied from the outside of the fuel cell reacts and produce water to.

【0006】図5は、従来の固体高分子型燃料電池の単セル構造を示す断面図である。 [0006] Figure 5 is a sectional view showing a unit cell structure of a conventional polymer electrolyte fuel cell. 固体高分子電解質膜1の両主面には、電極触媒層2がホットプレスによる熱圧着により一体化されており、さらにその両側に電極基材3 The solid on both main surfaces of the polymer electrolyte membrane 1, an electrode catalyst layer 2 are integrated by thermocompression bonding by hot pressing, further electrode substrate 3 on both sides
が固体高分子電解質膜1に縁近傍領域7で接着剤にて接着されて固体高分子電解質膜/電極接合体(以下、電解質膜/電極接合体という)6を構成している。 There solid polymer electrolyte membrane 1 in the edge vicinity region 7 are bonded with an adhesive polymer electrolyte membrane / electrode assembly (hereinafter, electrolyte membrane / of electrode assemblies) forms a 6. さらに前記電解質膜/電極接合体6の両面にセパレータ5が配置されて単セルが形成されている。 Further, the separator 5 on both surfaces of the electrolyte membrane / electrode assembly 6 is disposed unit cell is formed. 前記電極基材3の材料としては、多孔性の導電性シート材、例えばカーボンペーパー等が用いられる。 The material of the electrode substrate 3, a porous conductive sheet material, for example, carbon paper or the like is used. またセパレータ5は、ガス不透過性の材料からなり、前記電解質膜/電極接合体6と接する側の主面に反応ガス通流路として機能する凹凸が形成されている。 The separator 5 is made of a gas impermeable material, the unevenness serves to the main surface of contact with the electrolyte membrane / electrode assembly 6 side as a reaction gas flow path is formed.

【0007】図5に示すごとく電極基材3と固体高分子電解質膜1とはその積層方向から見た寸法が同じ、若しくは、電極基材3の方が固体高分子電解質膜1よりも小さくなるように形成されている。 [0007] dimensions as viewed from the stacking direction of the electrode substrate 3 and the solid polymer electrolyte membrane 1 as shown in FIG. 5 are the same, or, toward the electrode substrate 3 is smaller than the solid polymer electrolyte membrane 1 It is formed so as to. このようにカソード側の電極基材3とアノード側の電極基材3との間に介在させる固体高分子電解質膜1を前記両電極基材3と同寸法以上にすることで、両電極基材3が接触して短絡が生じるのを防いでいる。 By thus be at least the same size of the solid polymer electrolyte membrane 1 is interposed between the both electrode substrate 3 between the cathode side of the electrode substrate 3 and the anode side of the electrode substrate 3, the electrodes substrate 3 is prevented from short circuit and contact occurs.

【0008】各電極4に供給される反応ガスは、セパレータ5に設けられた図示しない反応ガス導入口及び排出口から各単セルへ導入及び排出される。 [0008] The reaction gas supplied to the electrode 4 is introduced and discharged from the reaction gas inlet and outlet (not shown) provided in the separator 5 to each single cell. 前記の反応ガス導入口及び排出口は、固体高分子電解質膜1の電極触媒層2が形成されていない縁近傍領域7に相対する部分に形成されるので、固体高分子電解質膜1の縁近傍領域7 The reaction gas inlet and outlet of the, since the solid polymer electrolyte membrane 1 of the electrode catalyst layer 2 is formed on the portion facing to the edge vicinity region 7 is not formed, near the edge of the solid polymer electrolyte membrane 1 area 7
は、そのために要する幅(縁から電極触媒層2が形成されている部分までの距離)を有している必要がある。 Needs to have a width (distance from the edge to the portion where the electrode catalyst layer 2 is formed) necessary for that.

【0009】 [0009]

【発明が解決しようとする課題】上記のように、従来の固体高分子電解質型燃料電池では、固体高分子電解質膜1は、電極触媒層2が形成された領域の周囲部分に電極触媒層2が形成されていない縁近傍領域7を有している。 As described above [0005] In the conventional solid polymer electrolyte fuel cell, the solid polymer electrolyte membrane 1, the electrode catalyst layer 2 is the electrode catalyst layer on the peripheral portion of the formed region 2 It has an edge vicinity region 7 but not formed. しかしながら、固体高分子電解質膜1は価格が高いことから、固体高分子電解質膜1の電極触媒層2が形成されない領域は設けないか、または出来るだけ小さくすることが望ましい。 However, the solid polymer electrolyte membrane 1 from high price, it is desirable to minimize the solid polymer electrolyte membrane or the first electrode catalyst layer 2 is not provided a region not formed, or can be.

【0010】そこで、本発明は、電極4間の短絡を生ずることなく高価な固体高分子電解質膜1の使用量を低減した低コストの電解質/電極接合体6及び固体高分子電解質型燃料電池を提供するものである。 [0010] Therefore, the present invention is an expensive polymer low cost electrolyte / electrode assembly 6 and the solid polymer electrolyte fuel cell with a reduced amount of the electrolyte membrane 1 without causing a short circuit between the electrodes 4 it is intended to provide.

【0011】 [0011]

【課題を解決するための手段】上記の目的を達成するために本発明においては、中央部に固体高分子電解質膜領域、その周辺部に絶縁膜領域を有する固体高分子電解質膜/絶縁膜接着シートの両主面に、アノード電極およびカソード電極とを形成することにより電解質膜/電極接合体を構成することとする。 In the present invention in order to achieve the above object In order to achieve the above, the solid polymer electrolyte membrane area in the central portion, the solid polymer electrolyte membrane / insulation film adhesive having an insulating film region to the periphery on both main surfaces of the sheet, and that of the membrane / electrode assembly by forming an anode electrode and a cathode electrode. 前記絶縁膜領域はプラスチックシートおよびゴムシートの何れかにより形成することとする。 The insulating layer region is formed by a one of a plastic sheet and rubber sheet.

【0012】本願発明に係る電解質膜/電極接合体においては、小面積の固体高分子電解質膜を用いることにより低コストが図れると共に、小面積の固体高分子電解質膜を用いても、固体高分子電解質膜の周辺部に絶縁膜を額縁状に設けることで固体高分子電解質膜/絶縁膜接着シートの大きさを電極基材以上になるように形成すれば、当該固体高分子電解質膜/絶縁膜接着シートの両主面に設けられるアノード電極とカソード電極との短絡も防止することができる。 [0012] In the electrolyte membrane / electrode assembly according to the present invention, together with low cost can be achieved by using a solid polymer electrolyte membrane having a small area, even using a solid polymer electrolyte membrane having a small area, solid polymer by forming such that the solid polymer electrolyte membrane / insulation film size of the adhesive sheet over the electrode substrate by providing the insulating film on the periphery of the electrolyte membrane in a frame shape, the solid polymer electrolyte membrane / insulation film short circuit between the anode electrode and the cathode electrode provided on both major surfaces of the adhesive sheet can be prevented.

【0013】さらに、本願発明においては、上記のような電解質膜/電極接合体をセパレーターで挟持して固体高分子電解質型燃料電池を構成するものとすれば、安価な固体高分子電解質型燃料電池を得ることができる。 Furthermore, in the present invention, if as constituting a solid polymer electrolyte fuel cell electrolyte membrane / electrode assembly was sandwiched by a separator as described above, inexpensive solid polymer electrolyte fuel cell it is possible to obtain.

【0014】またさらに、本願発明の固体高分子型燃料電池において、前記セパレーターの電解質膜/電極接合体に接する側の主面の縁近傍領域が、前記固体高分子電解質膜/絶縁膜接着シートの絶縁膜領域に直接接して積層されることすれば、従来、アノード側セパレーターおよびカソード側セパレータの接合部分に挿入されていたガス漏洩防止用ゴムシールが不要となり、部品点数および製作工程を簡略化することができる。 [0014] Further, in the polymer electrolyte fuel cell of the present invention, the edge vicinity region of the electrolyte membrane / electrode in contact with the assembly side main surface of the separator, the solid polymer electrolyte membrane / insulation film of the adhesive sheet if it is laminated in direct contact with the insulating film region, conventionally, the anode-side separator and the cathode-side gas leakage preventing rubber seal that is inserted in the joint portion of the separator is not required, simplifying the number of components and fabrication steps that can.

【0015】 [0015]

【発明の実施の形態】図1は、本願発明に係る電解質膜/電極接合体に用いられる固体高分子電解質膜/絶縁膜接着シートの構造を示す図で、(a)〜(c)はその断面図を(d)は当該シートの一面を上から見た図を示す。 Figure 1 DETAILED DESCRIPTION OF THE INVENTION is a diagram showing a solid polymer electrolyte membrane / insulation film structure of the adhesive sheet used in the electrolyte membrane / electrode assembly according to the present invention, (a) ~ (c) thereof the cross section (d) of shows a view from above one side of the sheet. この固体高分子電解質膜/絶縁膜接着シートは、従来の電解質膜/電極接合体に用いられていた固体高分子電解質膜に代えて用いられるものである。 The solid polymer electrolyte membrane / insulation layer adhesive sheet is used in place of the solid polymer electrolyte membrane used in conventional electrolyte membrane / electrode assembly. 図1においては、従来構造と同じ構成部材には同一の符号を付し説明を省略する。 In Figure 1, the same components as the conventional structure will not be described denoted by the same reference numerals.

【0016】図1の(a)は、一辺の長さが固体高分子電解質膜1よりも大なる絶縁膜の中央部をくり抜いて額縁状に形成した2枚の絶縁膜10Aにより固体高分子電解質膜1の縁部分を挟持して接着剤で接着することにより、中央部に固体高分子電解質膜領域11をその周辺部に絶縁膜領域12を有する1枚の固体高分子電解質膜/ [0016] in FIG. 1 (a), the solid polymer electrolyte by two insulating films 10A formed in a frame shape hollowed with a side length of a central portion of the large-made insulating film than the solid polymer electrolyte membrane 1 by bonding the edge portion of the film 1 in a sandwich with the adhesive, a solid polymer electrolyte membrane region 11 to the peripheral portion to the central portion of one having an insulating film region 12 solid polymer electrolyte membrane /
絶縁膜接着シート13に形成したものの厚さ方向の断面構造を示したものである。 It shows the thickness direction of the cross-sectional structure of those formed in the insulating film adhesive sheet 13. (b)も同様に中央部をくり抜いて額縁状にした1枚の絶縁膜10Aの中央部に固体高分子電解質1を接着剤にて接着して1枚の固体高分子電解質膜/絶縁膜接着シート13としたもの、(c)は中央部をくり抜いて額縁状にした1枚の絶縁膜10Aの中央部に固体高分子電解質膜1を配置し、さらに、両者を接着するのに適宜必要な大きさの絶縁膜10Bを積層してこれらを接着し、1枚の固体高分子電解質膜/絶縁膜接着シート13に形成したものの断面構造である。 (B) similarly bonded to one of the solid polymer electrolyte membrane / insulation layer bonded to the solid polymer electrolyte 1 in a central portion of one of the insulating film 10A which is like a frame hollowed central section with an adhesive those with sheet 13, (c) is a solid polymer electrolyte membrane 1 is disposed in a central portion of one of the insulating film 10A which is like a frame hollowed central portion, further, suitably required to adhere to each other by laminating the size of the insulating film 10B is bonded them, a cross-sectional structure of those formed on one of the solid polymer electrolyte membrane / insulation layer adhesive sheet 13.

【0017】このような固体高分子電解質膜/絶縁膜接着シート13に電極触媒層2を形成した場合の構造断面図を図2に示す。 [0017] A structural cross-sectional view of a case of forming an electrode catalyst layer 2 in such a solid polymer electrolyte membrane / insulation layer adhesive sheet 13 in FIG. 電極触媒層2の形成方法には、例えば図1(a)に示す固体高分子電解質膜/絶縁膜接着シート13の両主面の固体高分子電解質領域11に電極触媒層2をホットプレスによる熱圧着により接着形成する方法があり、このようにして電極触媒層2が形成された固体高分子電解質膜/絶縁膜シート13の断面構造は図2 The method for forming the electrode catalyst layer 2, for example, a solid polymer electrolyte membrane / insulation film heat a solid polymer electrolyte part 11 in the electrode catalyst layer 2 on both main surfaces by hot pressing the adhesive sheet 13 shown in FIG. 1 (a) There is a method of bonding formed by crimping, the cross-sectional structure of the solid polymer electrolyte membrane / insulation film sheet 13 in this manner to the electrode catalyst layer 2 was formed in FIG. 2
(a)に示される。 It is shown in (a). あるいは、固体高分子電解質膜/絶縁膜接着シート13を作製する前に、固体高分子電解質膜1に電極触媒層2をホットプレスによる熱圧着により接着形成しておき、その後、この電極触媒層2が形成された固体高分子電解質膜1と絶縁膜10Aとを接着しても良く、このようにして電極触媒層2が形成された固体高分子電解質膜/絶縁膜シート13の断面構造を示す図が図2(b)である。 Alternatively, prior to making a solid polymer electrolyte membrane / insulation layer adhesive sheet 13, the electrode catalyst layer 2 to the solid polymer electrolyte membrane 1 in advance bonded by thermal compression bonding by hot pressing, then, the electrode catalyst layer 2 It illustrates but may be bonded to the solid polymer electrolyte membrane 1 which is formed with an insulating film 10A, the way the electrode catalyst layer 2 is formed solid cross-sectional structure of the polymer electrolyte membrane / insulation film sheet 13 There is a drawing 2 (b).

【0018】上述のようにして電極触媒層2が形成された固体高分子電解質膜/絶縁膜接着シート13の両主面の絶縁膜領域12に接着剤を塗布した後、電極基材3を積層して接着することにより、本願発明の電解質膜/電極接合体を得る。 [0018] After an adhesive is applied to the insulating film region 12 of both main surfaces of the solid polymer electrolyte membrane / insulation layer adhesive sheet 13 on which the electrode catalyst layer 2 as described above are formed, the laminated electrode substrate 3 by bonding to obtain an electrolyte membrane / electrode assembly of the present invention. その一例を図2(c)に示す。 One example is shown in Figure 2 (c). 図2 Figure 2
(c)に示す電解質膜/電極接合体6は、図1(b)に示す固体高分子膜/絶縁膜接着シート13に電極触媒層2を形成した後、電極基材3を積層形成したものである。 Membrane / electrode assembly 6 shown in (c), after forming an electrode catalyst layer 2 in the solid polymer membrane / insulation layer adhesive sheet 13 shown in FIG. 1 (b), which the electrode substrate 3 is laminated it is.

【0019】なお、固体高分子電解質膜/絶縁膜接着シート13の形成にあたっては、上述の様に中央部がくり抜かれて額縁状に形成された絶縁膜に固体高分子電解膜を接着する方法の他、短冊型の絶縁膜を固体高分子電解質膜の周囲に額縁状に接着する等の方法がある。 [0019] Incidentally, when the formation of the solid polymer electrolyte membrane / insulation layer adhesive sheet 13, the method of bonding the solid polymer electrolyte membrane in an insulating film central portion is hollowed out by formed in a frame shape as described above other, an insulating film of the strip-type is a method such as bonding in a frame shape around the solid polymer electrolyte membrane.

【0020】また、前者の方法においては、図3の様に大面積の絶縁膜10Cの所定部分を複数くり抜いておき、当該くり抜いた部分に固体高分子電解質膜1を接着後、図中点線で示すように切り離すこととすれば簡単に量産することが出来る。 [0020] In the former method, previously hollowed plurality of predetermined portions of the insulating film 10C having a large area as in FIG. 3, to the hollowed portion after bonding the solid polymer electrolyte membrane 1, a dotted line in FIG. it can be easily mass-produced if be separated as shown.

【0021】次に、図1(a)および図2(a)に示した固体高分子電解質膜/絶縁膜接着シートを用いて固体高分子電解質型燃料電池を製作した場合の実施例を図4 Next, FIG. 4 an embodiment in which produced a solid polymer electrolyte fuel cell using a solid polymer electrolyte membrane / insulation film adhesive sheet shown in FIG. 1 (a) and FIGS. 2 (a)
に示す。 To show.

【0022】図4(a)は、図2(a)に示すように電極触媒層2が形成された前記固体高分子電解質膜/絶縁膜接着シート13の両面に当該固体高分子電解質膜/絶縁膜接着シートと同寸法の電極基材3を設けて電解質膜/電極接合体6とし、さらにこの電解質膜/電極接合体6をセパレーター5で挟持して固体高分子電解質型燃料電池を構成した場合の実施例の図である。 [0022] FIG. 4 (a), the solid polymer electrolyte membrane / insulation on both sides of the solid polymer electrolyte membrane / insulation layer adhesive sheet 13 which is an electrode catalyst layer 2 as shown in FIG. 2 (a) is formed provided electrode substrate 3 of film adhesive sheet and the same dimensions as the membrane / electrode assembly 6, if further this electrolyte membrane / electrode assembly 6 with the separator 5 is sandwiched between constitute the solid polymer electrolyte fuel cell it is a diagram of the embodiment. 図に示すように、二つのセパレータはその縁部分で互いに接しているが、この接合面からの反応ガスの漏洩を防ぐためにゴムシール材14を介在させている。 As shown, although the two separator are in contact with each other at their edge portions, it is interposed a rubber seal member 14 to prevent leakage of the reaction gas from the joint surface.

【0023】一方、図4(b)は、図2(a)に示すように電極触媒層2が形成された前記固体高分子電解質膜/絶縁膜接着シート13の両面に、当該前記固体高分子電解質膜/絶縁膜接着シート13よりも一回り小さい寸法の電極基材3を設けて電解質膜/電極接合体6とし、 On the other hand, FIG. 4 (b), on both surfaces of the solid polymer electrolyte membrane / insulation layer adhesive sheet 13 which is an electrode catalyst layer 2 as shown in FIG. 2 (a) is formed, the said polymer membrane / insulation layer adhesive sheet 13 by the electrode substrate 3 of smaller dimensions slightly larger provided than the membrane / electrode assembly 6,
さらにこの電解質膜/電極接合体6をセパレーター5で挟持した場合の実施例を示している。 Further shows an embodiment in which sandwiches the membrane / electrode assembly 6 in the separator 5. 本構成においては、アノード側およびカソード側セパレーター5の電解質膜/電極接合体6に相対する側の主面の縁近傍領域が、固体高分子電解質膜/絶縁膜接着シート13の絶縁膜領域12(図1)に直接接して積層されることとなるので、図4(a)の構成において用いられているガス漏洩防止用のゴムシール材14を省略することができるという利点がある。 In this configuration, the edge vicinity region of the opposite side of the main face to the electrolyte membrane / electrode assembly 6 of the anode side and the cathode side separator 5, the insulating film region 12 of the solid polymer electrolyte membrane / insulation layer adhesive sheet 13 ( since the be stacked in direct contact in FIG. 1), there is an advantage that it is possible to omit the rubber seal member 14 for gas leakage prevention, which is used in the construction of FIG. 4 (a).

【0024】なお、これらの固体高分子電解質型燃料電池のセパレーター5には、アノード電極およびカソード電極に導いて発電反応に供される燃料ガスおよび酸化剤ガスの通流溝として機能する凹凸が形成されている。 [0024] Incidentally, the separator 5 of a solid polymer electrolyte fuel cell, uneven functioning as flowing grooves of the fuel gas and the oxidizing gas is used for power generation reaction leading to the anode electrode and the cathode electrode formation It is. この反応ガス通流溝へ反応ガスを導入するための反応ガス導入口8が、セパレーター5の固体高分子電解質膜/絶縁膜接着シート13の絶縁膜領域12に相対する部分に形成される。 The reaction gas inlet 8 for introducing a reaction gas into the reaction gas passage groove is formed in a portion facing the insulating film region 12 of the solid polymer electrolyte membrane / insulation layer adhesive sheet 13 of the separator 5.

【0025】本発明では、固体高分子電解質膜/絶縁膜接着シート13に用いる絶縁膜(10A〜10C)として、例えばポリエチレンテレフタラート、ポリエチレン等からなる汎用的なプラスチックシート及びゴムシート等が用いられる。 [0025] In the present invention, as the insulating film used for the solid polymer electrolyte membrane / insulation layer adhesive sheet 13 (1OA - 1OC), such as polyethylene terephthalate, a generic plastic sheet and rubber sheets made of polyethylene or the like is used . また、電極基材3としては、例えばカーボンペーパー等の多孔性導電性シートを用いることができる。 As the electrode substrate 3, for example, it may be used a porous conductive sheet, such as a carbon paper.

【0026】 [0026]

【発明の効果】上述のように、本発明によれば、固体高分子電解質膜の縁近傍領域に額縁状に絶縁膜を配置して接着して固体高分子電解質膜/絶縁膜接着シートを形成し、これを介してアノード電極及びカソード電極とが配設されてなる電解質膜/電極接合体とすることにより、 (1)高価な固体高分子電解質膜の使用量を従来より大幅に低減した固体高分子膜/電極接合体が製造できるため、低コスト化が図れる。 [Effect of the Invention] As described above, according to the present invention, form a solid polymer electrolyte membrane / insulation film adhesive sheet was adhered by placing a frame-shaped insulating film to the edge vicinity region of the solid polymer electrolyte membrane and, by an anode electrode and a cathode electrode is disposed electrolyte membrane / electrode assembly through which, (1) an expensive solid polymer electrolyte membrane solids amount was significantly reduced compared with the conventional since the polymer membrane / electrode assembly can be manufactured, cost reduction can be achieved.

【0027】(2)固体高分子電解質膜の周囲が絶縁膜により保護されることとなるので、電解質膜/電極接合体の製造工程において、特に手作業での取り扱いが容易になり、発電性能に影響する固体高分子電解質膜の損傷等が減って歩留まりが向上した。 [0027] (2) Since the periphery of the solid polymer electrolyte membrane is to be protected by the insulating layer, in the manufacturing process of the membrane / electrode assembly, is especially easy to handle by hand, the power generation performance yield decreases damage to the impact to the solid polymer electrolyte membrane is improved.

【0028】(3)さらに、上記本発明に係る電解質膜/電極接合体をセパレータで挟持して単セルを形成する場合においては、固体高分子電解質膜/絶縁膜接着シートの絶縁膜領域の両主面にセパレータの縁近傍領域が直接接触して積層される構成とすれば、アノード側セパレータとカソード側セパレータとの接合部分に従来介在させていたガス漏洩防止用のゴムシール材が不用となり、 [0028] (3) Further, in the case of forming a single cell membrane / electrode assembly sandwiched by separators according to the present invention, both of the solid polymer electrolyte membrane / insulation film adhesive sheet of insulating film region if the configuration edge vicinity region of the separator on the main surface is laminated in direct contact with rubber seal member becomes unnecessary on the anode side separator and the cathode-side gas leakage prevention, which had then conventionally interposed connecting portion between the separator,
セル構造が簡略化され、コストの低減を図ることができる。 The cell structure be simplified, thereby reducing the cost.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の実施例に係る固体高分子電解質型燃料電池の電解質膜/電極接合体に用いられる固体高分子電解質膜/絶縁膜接着シートの構造を示す断面図。 Figure 1 is a cross-sectional view showing a solid polymer electrolyte membrane / insulation film structure of the adhesive sheet used in the electrolyte membrane / electrode assembly of a solid polymer electrolyte fuel cell according to an embodiment of the present invention.

【図2】本発明に係る電解質膜/電極接合体の製造過程段階における構造断面図。 Structural cross-sectional view in a manufacturing process step of the electrolyte membrane / electrode assembly according to the invention; FIG.

【図3】本発明に係る固体高分子電解質膜/絶縁膜接着シートの量産過程の一例を示す図。 It illustrates an example of a solid polymer electrolyte membrane / insulation film adhesive sheet production process according to the present invention; FIG.

【図4】本発明に係る固体高分子電解質型燃料電池の構造を示す断面図。 Sectional view showing the structure of a solid polymer electrolyte fuel cell according to the present invention; FIG.

【図5】従来の固体高分子電解質型燃料電池の単セル構造を示す断面図。 5 is a sectional view showing a unit cell structure of a conventional solid polymer electrolyte fuel cell.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 固体高分子電解質膜 2 電極触媒層 3 電極基材 4 電極 5 セパレータ 6 電解質膜/電極接合体 7 縁近傍領域 8 反応ガス導入口 9 反応ガス排出口 10 絶縁膜 11 固体高分子電解質膜領域 12 絶縁膜領域 13 固体高分子電解質膜/絶縁膜接着シート 14 ゴムシール材 1 a solid polymer electrolyte membrane 2 electrode catalyst layer 3 electrode substrate 4 electrode 5 separator 6 electrolyte membrane / electrode assembly 7 edgewise region 8 reactive gas inlet 9 a reaction gas outlet 10 insulating film 11 polymer electrolyte membrane region 12 insulating film region 13 solid polymer electrolyte membrane / insulation film adhesive sheet 14 rubber sealing material

Claims (4)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】中央部に固体高分子電解質膜領域、その周辺部に絶縁膜領域を有する固体高分子電解質膜/絶縁膜接着シートと、当該シートの両主面に形成されたアノード電極およびカソード電極とから成ることを特徴とする電解質膜/電極接合体。 1. A solid polymer electrolyte membrane area in the central portion, a solid polymer electrolyte membrane / insulation film adhesive sheet having an insulating film region on its periphery, an anode electrode and a cathode formed on both main surfaces of the sheet membrane / electrode assembly characterized in that it consists of an electrode.
  2. 【請求項2】前記絶縁膜領域がプラスチックシートおよびゴムシートの何れかから成ることを特徴とする請求項1記載の電解質膜/電極接合体。 Wherein said insulating membrane / electrode assembly of claim 1, wherein the membrane region is characterized in that it consists either of a plastic sheet and rubber sheet.
  3. 【請求項3】請求項1または2の何れかに記載の電解質膜/電極接合体をセパレーターで挟持して成る固体高分子電解質型燃料電池。 3. A process according to claim 1 or 2 or the membrane / formed by sandwiching the electrode assembly to a separator solid polymer electrolyte fuel cell according.
  4. 【請求項4】請求項3記載の固体高分子電解質型燃料電池において、前記セパレーターの電解質膜/電極接合体に接する側の主面の縁近傍領域が、前記固体高分子電解質膜/絶縁膜接着シートの絶縁膜領域に直接接して積層されることを特徴とする固体高分子電解質型燃料電池。 4. A solid polymer electrolyte fuel cell according to claim 3, wherein, the edge vicinity region of the main surface of the side in contact with the electrolyte membrane / electrode assembly of the separator, the solid polymer electrolyte membrane / insulation film adhesive solid polymer electrolyte fuel cell characterized in that it is laminated in direct contact with the insulating film region of the sheet.
JP18184599A 1999-06-28 1999-06-28 Electrolytic film/electrode bonded body and solid polyelectrolyte type fuel cell Pending JP2001015127A (en)

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JP2003068318A (en) * 2001-08-23 2003-03-07 Osaka Gas Co Ltd Cell of solid polymer fuel cell and solid polymer fuel cell
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US7425383B2 (en) 2001-10-31 2008-09-16 Hitachi, Ltd. Electrode for polymer electrolyte fuel cell, separator therefore, and polymer electrolyte fuel cell, and generating system using them
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JP2003068318A (en) * 2001-08-23 2003-03-07 Osaka Gas Co Ltd Cell of solid polymer fuel cell and solid polymer fuel cell
US7425383B2 (en) 2001-10-31 2008-09-16 Hitachi, Ltd. Electrode for polymer electrolyte fuel cell, separator therefore, and polymer electrolyte fuel cell, and generating system using them
US7659028B2 (en) 2001-10-31 2010-02-09 Hitachi, Ltd. Polymer electrolyte fuel cell
US8309268B2 (en) 2003-08-22 2012-11-13 Johnson Matthey Fuel Cells Limited Sealing of a membrane electrode assembly
US8551668B2 (en) 2003-08-22 2013-10-08 Johnson Matthey Fuel Cells Limited Sealing of a membrane electrode assembly
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US8512907B2 (en) 2007-09-27 2013-08-20 Dai Nippon Printing Co., Ltd. Membrane catalyst layer assembly with reinforcing films, membrane electrode assembly with reinforcing films, and polymer electrolyte fuel cells
US8329322B2 (en) 2007-10-12 2012-12-11 Panasonic Corporation Electrode-membrane-frame assembly for polyelectrolyte fuel cell, manufacturing method therefor, and polyelectrolyte fuel cell
WO2009047908A1 (en) * 2007-10-12 2009-04-16 Panasonic Corporation Electrode-film-frame joint for polymer electrolyte type fuel cell, its manufacturing method, and polymer electrolyte type fuel cell
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JP5024386B2 (en) * 2007-11-28 2012-09-12 トヨタ自動車株式会社 Single cell of a fuel cell
WO2009069771A1 (en) * 2007-11-28 2009-06-04 Toyota Jidosha Kabushiki Kaisha Unit cell of fuel battery
JP2010067602A (en) * 2008-08-11 2010-03-25 Dainippon Printing Co Ltd Laminate of electrolyte membrane-catalyst layer with reinforcing sheet, and polymer electrolyte fuel cell equipped therewith
JP2010080437A (en) * 2008-08-27 2010-04-08 Dainippon Printing Co Ltd Electrolyte membrane-catalyst layer laminate with reinforcing sheet and polymer electrolyte fuel cell equipped with the same
JP2010257943A (en) * 2009-03-30 2010-11-11 Sanyo Electric Co Ltd Composite film, fuel cell, and method of manufacturing composite film
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